Dont ask me citation, by just providing supersitious article and reference. Not even peer-reviewed...Superb. Did you read the article on top of this thread ?
Evidence that protein requirements have been significantly underestimated
Rajavel Elango 1, Mohammad A Humayun, Ronald O Ball, Paul B Pencharz
Affiliations expand
PMID: 19841581 DOI: 10.1097/MCO.0b013e328332f9b7
A high protein diet (3.4 g/kg/d) combined with a heavy resistance training program improves body composition in healthy trained men and women – a follow-up investigation
The most protein dense food is red meat. And the most complete an amino-acid panel. So basically increase your meat intake.
As a carnivore myself i eat around 1kg of beef a day